Re: I request inclusion of reiser4 in the mainline kernel

[Nikita Danilov]

Hans Reiser writes:
 > Horst von Brand wrote:
 > 
 > >
 > >
 > >Funny that the "texbook algorithms" aren't used in real life. Wonder why...
 > >  
 > >
 > Try BSD.  If the BSD book can be believed, they use"texbook algorithms".

The "textbook" one-way elevator (as indeed exemplified by FreeBSD's
src/sys/kern/subr_disk.c:bioq_disksort()) has well-known weaknesses. For
example,

    dd if=/dev/zero of=FILE

can easily monopolize device queue and starve accesses to the blocks
with low block numbers.

 > 
 > ;-)

Nikita.
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